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Environmental Earth Sciences

, Volume 61, Issue 5, pp 931–937 | Cite as

Compacted sewage sludge as a barrier for tailing impoundment

  • Bao Wang
  • Huyuan ZhangEmail author
  • Zhiming Fan
  • Yuanyuan Ju
Original Article

Abstract

The feasibility of compacted sewage sludge serving as a barrier for tailing impoundment was evaluated by the batch test and hydraulic conductivity test with respect to heavy metal retardation and impermeability. The batch test results showed that the effective removal of heavy metals approached 97.8 and 93.4% for Zn and Cd, respectively. Formation of precipitation of oxy(hydroxide) and carbonate minerals was mainly responsible for the attenuation of heavy metals in the early period of the test. Nevertheless, the further removal of heavy metals can be attributed to the sulfate reduction. The hydraulic conductivity test indicated that almost all of the heavy metals contained in simulated acid pore water were retarded by compacted sewage sludge. The hydraulic conductivity of the compacted sewage sludge ranged from 3.0 × 10−8 to 8.0 × 10−8 cm s−1, lower than 1.0 × 10−7 cm s−1, which is required by regulations for the hydraulic barrier in landfill sites. Thus, this study suggested that compacted sewage sludge could be used as a bottom barrier for tailing impoundment.

Keywords

Sewage sludge Barrier Acid mine drainage Sulfate reduction 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (grant no. 50678075).

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Bao Wang
    • 1
  • Huyuan Zhang
    • 1
    Email author
  • Zhiming Fan
    • 1
  • Yuanyuan Ju
    • 1
  1. 1.Key Laboratory of Mechanics on Disaster and Environment in Western ChinaLanzhou University, Ministry of EducationLanzhouPeople’s Republic of China

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